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ASU 2014-09, Revenue - Revenue from Contracts with Customers (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of new accounting principle in period of adoption     $ 64
Sales and other operating revenues [1] $ 18,694 $ 16,134  
Cost of revenues [1] 17,370 14,946  
Matching buy/sell receivables 1,330    
Income taxes receivables 323    
Consumer Excise Tax      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Sales and other operating revenues   1,200  
Cost of revenues   $ 1,200  
Accounting Standards Update 2014-09      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of new accounting principle in period of adoption     $ 1
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Consumer Excise Tax      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Sales and other operating revenues 1,250    
Cost of revenues 1,250    
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Third Party Reimbursements, Noncash Consideration and Imbalances      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Sales and other operating revenues 117    
Cost of revenues $ 117    
[1] The 2018 period reflects an election to present certain taxes on a net basis. See Notes 2 and 3 for further information.